Controller for carbureters.



A. G. STEWART.

CONTROLLER FOR UARBURETERS.

APPLICATION FILED APR. 27,1908.

91 6 1 a Patented Mar. 23, 1909.

jig/6 71:5277 Z/ZMsgeis; (TOYkiqQ/i 76m (4/ Xi-Q73 1 {X 1 lov. 35, 1907, and the object oi the invenall maintains a delinite and rasrnnr oriueu.

ALFRED C. STEWART, 01" LOS ANGELES, UALIFORNIA.

CONTROLLER FOR CABBURETEBS.

Specification of Letters Patent.

fatonted March 21}, 1909.

Application lllCd April 27, 1908. Serial No. 429,562.

To all whom it may unicorn:

Be it known that .l, Anrnnn S'rnv-xwirr, a citizen of the United States, residing at Los Angeles, in the count; ol' lies Angeles and State of California, have invented a new and useful (.ontroller i'or Carburetors, cl which the following: is a specification.

This invention relates to means for moditying the action ol' a carluuelei Jer YIN) ing 1 the mixture from a given dolinile condition to another delinite (-oniilt'on as to rirhnr The invention is particularly intended a use. in connection with a carhuretrr ior ini ternalcomlrustion engines, which automatiw i unizorm mixture under all ci'nulitions ol suction, such a carburcter being disclosed and claimed in my application, Serial No. 40351;, tiled tion in such connection is to provide means whercbv the carburetor can be inm'icdiately and easily changed i'ron'i a condition ol' maximum capacity oi the internal combustion engine, to a condition of maxinuun eilieiency or vice versa. It has beeniount'l desirable to provide the carburetor ol' deiinitc capacity, without provision tor graduated adjustment, thereby preventing unskilled persons from tampering or interi'ering with the apparatus, so as to render it inoperative: and to provide for most general conditions and for starting ability, it is usual to make or set the apparatus originally for proper supply oi mixture to give maximum capacity. Under certain conditions, howeveiy -for example, when speed has been attained and thiengine is runninglight, such setting oi" the carburetor i involves waste of luel and it is desirable to change the condition of the carl urcte' to supply less fuel, and it is also desirabl to make the change by a single delinite operation, so that the regulator, having been once set, the operator need not exercise any care in the gaging of the operation.

In the accompanying drawings 2* Figure 1 is a vertical section of the regulator, in connection with the cairlmreter, only so much ol the carburetor being; shown as is necessary to explain the invention. Fig. 2 is an end elevation of the regulator device Fig. 3 is a side elevation of part of an automobile, showing the application of the invention thereto.

'l he carburetor ll may be ol' the type shown in my prior application aloresaid, and the controller 2 consists of means for pneumatically controlling the action of the carburetor, by changing the condition of suction therein. i I

llcntroller Z cmnpriscs a casing 3 proyided wil h means such as flange i for attachment to a suitable support, said casin having a cylindrical recess 5, in which slides the enlarged head 3 ol a valve plug 7, the inner end 01 whit h is tapered or conical to seat into a \ulve opening 8 in the inner end 9 oi the casing. fr spring; ll) surrounds the valve pl'. :nd extends between the head 6 thereof and the inner end 5) of the casing, so as to tend to press the plug to open position. A screw llli it is screwed into the outer end ol' the recess 5, which is screw threaded at 12 to receive it, and the valve'hcad 6 has a stem 1? extending through a bore 14 in said screw plug, and projecting: beyond the dog to enable operation thereof by suitable means. i prefer to use, for operation of the valve stem, a foot piece adapted to be kicked or knocked over, the same consisting of a lever 1:3 pivoted to the casing 8 and adapted to hang down with its end 0rtion resting against the valve stem, the lever being weighted as at it) at the end, and the pivot oi' the lever being located inwardly from the center ol gravity of the lever, so as to cause the lever to tend to press the stem inwardly.

But by kicking the lever upit will be thrown over to the dotted line position, resting on top the casing and the valv'e plug will then be l'orccd to its outer or open position by the spring 10. A pipe ,17 connects the opening: 8 ol the controller with apart of the carlmretcr at which there is a condition of soot ion determining the. rate of feed of gasolene.

in the form ol' carburetor here shown, the carburetor casing 1 is formed with an oil chamber 18 in its lower part, an air chamber in above the oil chamber and a suction chamber 20 at the topz-see Fig. 3. The rasolene is supplied from a pipe 21 to the oil chamber 18, through a valve 2]., controlled by a spring and by a float 22, in such manner that the oil in the oil chamber is maintained at a definite level. A duct 23 lorined in the casing of the carburetor leads from the oil chamber at a point below the level of liquid therein, to an annular channel 24 at the upper part of the casing, and the control pipe' 17 leads from said duct. The upper chamber member 20, fastened onto the casing 1 has a shoulder 26 extending over the lip 27 of channel 24, to form between the lip and channel, an orifice I A connection shown at 28 in Fig. 3 extends from the upper chamber 20 of the carburetor to an internal combustion engine, so that a condition of suction exists in the said chamber 20. An automatic valve 30 formed as a frusto conical shell extends adjacent to the wall 31 of the upper member of the carbureter, to form an annular constricted mixing passage, said valve having a shoulder 36, seating on top the lip aforesaid to control the flow of air from the air chamber 19 which communicates with the outer air through air inlet opening 32. Valve 30 has a stem 35 worls ing in tubular guide 34, which also serves as a dash pot. The wall portion 31. is corrugated to increase the mixing eil'ect.

Normally the regulator will be in position shown in full lines in Fig. 1, the valve thereat being closed. Under these conditions the suction of the engine is exerted at each stroke, on the gasolene within duct 23, drawing a full supply of gasolene to the orifice 25 in accordance with the demands of the engine, the amount of oil drawn in at 25 and of air drawn in between the valve shoulder 36, and the lip 27, being in correspondence so that a mixture of definite and uniform richness is supplied to the engine, suitable, for example, for operating it with maximum capacity. But whcn the load is light and full speed has been attained, a full supply of rich mixture, or a mixture suitable for operation at maximum capacity, is not necessary, and to obtain increased efficiency, the operator kicks over the regulator lever 15 to throw it to dotted line position. The regulator .valve 7 is then opened by its spring 9, and a pneumatic connection is thus established from the gasolene duct 23 to the outer air. This operates to diminish the condition of suction in the said duct, and diminishesthc uplift of gasolene to the orifice 25. Less gasolene will therefore pass to the mixture and the latter will be poorer. The screw plug ll is set to such position that under these conditions the mixture will be adapted for operating the engine with maximum economy. A certain amount of air will also pass into the mixture from pipe 17 through the duct 23, but this will generally be inconsiderable in comparison with the quantity of air passing at the main carburetor valve 30 the capacity of the controller valve and its pipe being small compared to the capacity of the main valve, so that in this case also neuter air and a pipe may be bent around to bring the controller to any desired posit1on;for exam )le, the controller may be placed on the dash, as shown in Fig. 3, or it may be placed in any convenient position in the vehicle or plant.

What I claim is 1 l.' The combination with a carburetor having a suction chamber and an oil duct, a'

valve exposed to the suction chamber and controlling flow of oil and air thereinto in definite correspondence, and a pneumatic .controller comprisin a valve opening to the leading therefrom to the oil duct to relieve to a definite extent the condition of suction in the duct.

2. The combination with a carburetor having a suction chamber and an oil duct, a valve exposed to the suction chamber and controlling flow of oil and air thereinto in definite correspondence, and a pneumatic controller comprising a valve opening to the outer air and a pipe eading therefrom to the oil duct to relieve to a definite extent the condition of suction in the duct, and means for adjustably determining the opening movement of the valve.

3. The combination with a carburetor having a suction chamber :and an oil duct, a valve exposed to the suction chamber and controlling flow of oiland air thcrcinto in definite correspondence, and a pneumatic controller comprising a valve opening to the outer air and a pipe leading therefrom to the oil duct to relieve to a definite extent the condition of suction in the duct, and means for adj ustably determining the opening movement of the valve, a freely movable lever operating to automatically close said valve and a spring acting to automatically open the valve -when released from said lever. i

In testimony whereof, I, have hereunto set my hand at Los Angeles, California, this 14th day of April 1908. 1

ARTHUR P. KNIGHT, FRANK L. A.-GR-AHAM. 

